#include <LiquidCrystal_I2C.h>
#include "RTClib.h"
#include <Wire.h>
#include <Keypad.h>

RTC_DS1307 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};


LiquidCrystal_I2C lcd(0x27,16,2); // pins on arduino on which lcd pins are connected:
int fan1 =11,fan2=12,fan3=10;    // for 3 speeds of fan
int CoolON = 13; // for opening valve of cool water from chiler


int temp; // DegC from temperature sensor 

int value = 0;
int c = 0;
int setpoint = 0;

const byte numRows = 4; //number of rows on the keypad
const byte numCols = 4; //number of columns on the keypad

//keymap defines the key pressed according to the row and columns just as appears on the keypad
char keymap[numRows][numCols] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

//Code that shows the the keypad connections to the arduino terminals
byte rowPins[numRows] = {2, 3, 4, 5}; //Rows 0 to 3
byte colPins[numCols] = {6, 7, 8, 9}; //Columns 0 to 3

//initializes an instance of the Keypad class
Keypad myKeypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup()
{

  #ifndef ESP8266
  while (!Serial); // wait for serial port to connect. Needed for native USB
#endif
if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }
  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    // When time needs to be set on a new device, or after a power loss, the
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }

  // When time needs to be re-set on a previously configured device, the
  // following line sets the RTC to the date & time this sketch was compiled
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // This line sets the RTC with an explicit date & time, for example to set
  // January 21, 2014 at 3am you would call:
  // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));


  lcd.backlight();
lcd.init();

pinMode(CoolON,OUTPUT);
pinMode(fan1,OUTPUT);
pinMode(fan2,OUTPUT);
pinMode(fan3,OUTPUT);
Serial.begin(9600);
lcd.setCursor(5,0);
lcd.println("Welcome");
delay(2000);
}

void loop()
{
   DateTime now = rtc.now();

int sensorValue=analogRead(A0); // for reading temperature sensor:
int  temp = ((sensorValue*34)/1024); // for converting analog value to temperature
  lcd.setCursor(0,0);
  lcd.print("Temp : ");
  lcd.print(temp);// for reading temp value
 lcd.print(" DegC ");  


if (!((now.hour() > 7 && now.hour() <= 19 )))
{
  setpoint =24 ;
  lcd.setCursor(0,1);
  lcd.print("SP   : ");

lcd.print(setpoint);

}
else
{
  char keypressed = myKeypad.getKey();
  if (keypressed != NO_KEY)
  {
    //Serial.println(keypressed);
    if ( keypressed >= '0' && keypressed <= '9' ) {
      if (c < 2) {
        value = value * 10 + (keypressed - '0');
        //Serial.print("Value : ");
        //Serial.println(value);
        c++;
        if (c == 2) {
          if (value >= 9 && value <=30)
          {
          setpoint = value;
          lcd.setCursor(0,1);
          lcd.print("SP   : ");

          Serial.print(setpoint);
      
          lcd.print(setpoint);
          lcd.println(" DegC   ");
         
          
          }
          else{
             lcd.setCursor(0,0);
          lcd.println("SP:Invalid!!!");
          lcd.setCursor(0,1);
          lcd.println("Typ Val b/w 9&30");
          delay(2000);
          
          
          
          
          }
          value = 0;
          c = 0;
          
        }
      }
    }
  }
}   
     sensorValue=analogRead(A0); // for reading temperature sensor:
  temp = ((sensorValue*34)/1024); // for converting analog value to temperature
  lcd.setCursor(0,0);
  lcd.print("Temp : ");
  lcd.print(temp);// for reading temp value
 lcd.print(" DegC ");
 digitalWrite(fan1,LOW);
 digitalWrite(fan2,LOW);
 digitalWrite(fan3,LOW);
 digitalWrite(CoolON,LOW);
  




 
 if(setpoint == 0 ) return;

  if (setpoint >= (.9 * temp) && setpoint <=(1.25*temp))
  {
digitalWrite(fan1,HIGH);
digitalWrite(CoolON,HIGH);
  }
else if (setpoint >= (.8 * temp) && setpoint < (0.9 * temp)){
digitalWrite(fan2,HIGH);
digitalWrite(CoolON,HIGH);
}
else if (setpoint <= (.8*temp)){
digitalWrite(fan3,HIGH);  
digitalWrite(CoolON,HIGH);
}
 else  if (setpoint <= (.70*temp))
  {
digitalWrite(CoolON,HIGH);
digitalWrite(fan3,HIGH);

}
}